<template>
    <div class="login_container">
        <div class="login_box">
            <div class="avator_box">
                <img src="../assets/logo.png" alt="">
            </div>
            <el-form :model="loginForm" ref="loginFormRef" :rules="loginFormRules" label-width="0" class="login_form">
                <!-- 用户名 -->
                <el-form-item prop="username">
                    <el-input v-model="loginForm.username" prefix-icon="el-icon-user"></el-input>
                </el-form-item>
                <!-- 密码 -->
                <el-form-item prop="password">
                    <el-input type="password" v-model="loginForm.password"  prefix-icon="el-icon-lock"></el-input>
                </el-form-item>
                <!-- 按钮 -->
                <el-form-item class="btns">
                    <el-button type="primary" @click="login">登录</el-button>
                    <el-button type="info" @click="resetLoginForm('loginFormRef')">重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>
export default {
    data() {
        return {
            loginForm: {
                username: '',
                password: ''
            },
            loginFormRules: {
                username: [
                    { required: true, message: '请输入用户名称', trigger: 'blur' },
                    { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                ],
                password: [
                    { required: true, message: '请输入密码', trigger: 'blur' },
                    { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
                ]
            }
        }
    },
    methods: {
        resetLoginForm(formName) {
            this.$refs[formName].resetFields();
        },
        login() {
            this.$refs.loginFormRef.validate(async valid => {
                if(!valid) return;
                // 解构  async await es67的语法
                const {data: res} = await this.$http.post("login", this.loginForm);
                if(res.meta.status !== 200) {
                    return this.$message.error("登录失败! ");
                } else {
                    this.$message.success("登录成功! ");
                    /**
                     * 1. 将登录成功之后的token，保存在客户端的 sessionStorage中
                     * 2. token只在当前网站上打开期间生效，所以将token 保存在 sessionStorage   中
                     * 
                     */
                    window.sessionStorage.setItem("token", res.data.token);
                    this.$router.push('/home');
                }
            });
        }
    }
}
</script>

<style lang="less" scoped>
    .login_container {
        background-color: #2b4b6b;
        height: 100%;
    }

    .login_box {
        width: 450px;
        height: 300px;
        background-color: #fff;
        border-radius: 3px;
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);

        .avator_box {
            height: 130px;
            width: 130px;
            border: 1px solid #eee;
            border-radius: 50%;
            padding: 10px;
            box-shadow: 0 0 10px #dddddd;
            position: absolute;
            left: 50%;
            transform: translate(-50%, -50%);
            background-color: #fff;
            img {
                width: 100%;
                height: 100%;
                border-radius: 50%;
                background-color: #eee;
            }
        }
    }
    .login_form {
        position: absolute;
        bottom: 0;
        width: 100%;
        padding: 0 10px;
        box-sizing: border-box;
    }
    .btns {
        display: flex;
        justify-content: flex-end;
    }
</style>
